--- libserf-git-7e98c4d92.old/SConstruct
+++ libserf-git-7e98c4d92/SConstruct
@@ -289,12 +289,14 @@
 if unknown:
   print('Warning: Used unknown variables:', ', '.join(unknown.keys()))
 
-apr = str(env['APR'])
-apu = str(env['APU'])
-zlib = str(env['ZLIB'])
-expat = env.get('EXPAT', None)
+apr     = "__META_PRODTREE__/libapr"
+apu     = "__META_PRODTREE__/libapr"
+brotli  = "__META_PRODTREE__/brotli"
+expat   = "__META_PRODTREE__/expat"
+openssl = "__META_PRODTREE__/openssl"
+zlib    = "__META_PRODTREE__/zlib"
+
 gssapi = env.get('GSSAPI', None)
-brotli = env.get('BROTLI', None)
 unbound = env.get('UNBOUND', None)
 
 if gssapi and os.path.isdir(gssapi):